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pdtri
Inverse Poisson distribution.SYNOPSIS:
int k;
double m, y, pdtr();
m = pdtri(k, y);
DESCRIPTION:
Finds the Poisson variable x such that the integral from 0 to x of the Poisson density is equal to the given probability y.
This is accomplished using the inverse gamma integral function and the relation
m = igami(k+1, y).
ACCURACY:
See the igami Help topic.
ERROR MESSAGES:
message condition value returned
domain y < 0 or y >= 1 0.0
k < 0